* Implement Rallpack1 validation test (with a workaround
  for inability to set membrane conductance).
* Fix bug in L≠1 case in PassiveCable.jl (this may still be
  wrong).
* Fix bug in peak delta computation in trace analysis when
  both traces have no local maxima.
* Gentle failure on missing `numeric_soma.json`
* Allow multiple `-s` selection operations for `tsplot`,
  acting disjunctively.

* Amend data directory path in validation tests.
* Enmodulate `hh_soma.jl`
* Add HH channel reference data generations script.
* Switch `validate_soma.cpp` to numeric reference data.
* Consolidate common code in `validate_ball_and_stick.cpp`
* Add (nearly) Rallpack1 validation test (see below).
* Gentle failure on absence of reference data in
  `validate_ball_and_stick.cpp`

Can't yet override mechanism default parameter values,
so the cable cell model added to `test_common_cells.hpp`
lets the default stand; validation script will have
to use the default membrane conductance rather than that
given by Rallpack1.

* Use consistent scaling for y[1] scalar voltage in hh_soma.jl
* Also: add more reserved target names to CMakeLists.txt
  helper function.

* Move generation and data to top-level validation directory.
* Make BUILD_VALIDATION_DATA and VALIDATION_DATA_DIR cache vars.
* Add helper CMake functions for data generation.

Note `validation/ref/numeric/foo.sh` is just a placeholder.

* Align defaults with values used in most of the NEURON
  validation scripts.
* Use consistent 100 Ω·m bulk resistivity across both
  NEURON test models and basic validation cells.

Also:
* Ensure intrinsic and passive properties properly set on test cells.

Left out a factor of λ in equation 4.

* Expand comments, function documentation in Julia script.
* Use '#' for top level headers in `README.md`

* New file (Julia module): PassiveCable.jl
* Update script documentation for profstats
* Add (too brief) documentation for PassiveCable.jl
* Fix `env`, `python` invocation on python scripts.

add reference solution for hh soma test

* julia script that uses SUNDIALS to solve the single compartment
  model with HH channel. The model has 4 variables (voltage and
  3 gating variables), which are coupled in the solver (i.e. not
  split like in Neuron / nest-mc.
* SUNDIALS uses variable order stepping and variable size time steps
  with error detection to accurately integrate in time

Update README.md with current installation procedure.

 - changed back a non-typo (that will tech me to use spell checking...)
 - Output result of test-function as exit value

Add Julia installation steps and example run

Silence variable not used warning in validate.cpp
Add missing include to rangeutil.hpp

Make lambda transform iterators copy-assignable.

Enhanced validation tests.

* Add unit test that demonstrates need for non-const version
  of `max_element_by`
* Rename file stream member variable from `f_` to `out_`
  in `validation_data.hpp`.

Fixes support of scientific notation in modcc.

Also the corresponding unit test was rewritten in a less repetitive
manner.

Validation of simulation results by comparing L-infinity distance and maximum peak displacement in voltage traces taken at mid-points and end-points of sections.

Note that these tests will broadly _fail_ at this point.

Reference data generation and visualization:
* Use voltage traces as validation data from NEURON; refactor generation scripts.
* Generate validation data as a dependency of `validation.exe`.
* Store validation data in a `tsplot`-compatible format.
* Extend `tsplot` to handle multiple time series per file, a non-time 'time' axis (see `-A` option), filtering of time series by meta data queries (see `-s` option).
* Remove pre-generated spike-time validation data files.

Core extensions:
* Add a single-cell `singleton_recipe` recipe wrapper.
* Allow cell descriptions to be cloned (explicitly) for use with this wrapper.
* Add `simple_sampler` which maintains a trace of scalar observables as a vector of (time, value) pairs.
* Allow cell groups to be exposed from `mode...

modcc: support for comments starting with '?'

add unit test that shows bug in fvm

* add unit test fvm_multi.mechanism_indexes that fails to show
  bug in ticket #20
* add interface to fvm_multicell for getting list of stimuli
* add unit test that checks stimuli are correctly added to
  lowered cell

update modcc to latest modparser trunk

* update the out of date version of modparser was added to the repository
* fix some warnings about unused static functions in a modcc test header
* move modcc/src path contents to modcc, because there was little point having
  the additional sub directory.

Moved over modcc unit tests.