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Address inconsistencies in unit conversions between current updates, initialization, ionic currents etc. Fixes issues #793 and #798. * Correct units in comments for ion state iX_ to a current density. * Remove conversion factor for NMODL current densities [mA/cm²] to Arbor current densities [A/m²] from layout weight: from the point of view of Arbor, mechanisms now write in units that Arbor uses natively. * Remove weight_ as a magic modcc variable; applying weight_ is now performed directly by code generated by printers. * Change IndexedVariable interface: remove redundant index_name; remove 'op'. Whether external data is accumulated or assigned is now a property of the corresponding sourceKind. * Conversion factors for NMODL <-> Arbor are collated in printerutils.cpp, determined by the external data sourceKind. * Permit direct assignment of external data, as opposed to a weighted sum. This behaviour will be required for reversal potential handling...
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