Correct model parameters. Store cell morphology in pure NeuroML.

Also, deleted a useless synaptic model.
Add initial version of AMPA-mediated mf->grc synapse (NeuroML2).

Not yet functional.
Hack to make neuron happy about what lems spits out.

Seems to be working now, even though I should probably get rid of the
tsince thing and just give neuron the differential equation for the
depression factor recovery.
Prototype synapse with 4 exp components and Varela style STP.
Add spillover component to NeuroML2 AMPA-mediated synapse.
Add NMDA-mediated synapse and spike relay cell for test simulations.
Plug results from new exponential fit to NMDA waveform in nml model.

The new fit to Jason's model of the unblocked waveform uses two decay
time constants instead of one, and agrees much better with the
original.
Add script for I/O rate analysis of GrC model.
Add AMPA and NMDA synapse versions with no STP.

AMPA and NMDA componentType definitions have been moved to separate
nml files in the lemsDefinitions directory. This allows for easy
reuse of the same componentType for different synapses (in our case,
with and without plasticity).
Add simulations without STP to rate IO analysis script.
Add new NMDA blockage model from Schwartz2012.
Trying to figure out what's wrong with the NMDA blockage model.

The "hand corrected" version of the NMDA mod file at least compiles
and passes the modlunit check for dimensional consistence.
Add script to re-run the last sim with the hand-modified NMDA modfile.
Rate I/O analysis with hand-corrected NMDA mod file.

Also, comparison of the I/O properties are now made with a specific
model within Jason's model population: model number 156.
Fix Em value to match GrC model number 156.
Start conversion to Tsodyks-Markram plast model. Not yet functional.

This commit is to give a point where the "no such children list for
type (stpMechanism)" bug occurs. Just generate the "synapse_test"
simulation configuration in NeuroConstruct, export to NeuroMLv2beta,
and try to run with jnml.
Implement TM plasticity for AMPA spillover component.

Simulations are not running yet due to "no such children list" error;
parameters are still all dummy values anyway.
AMPA: set parameter values from my fit to Jason's experimental data.
Implement TM plasticity for NMDA.

The parameters being used are those from the fits I did to Jason's
experimental data.
Fix problem with "no such children list" error. simple_lems_test runs.

Anyway, NeuroML2 still doesn't seem to know about conductance-based
integrate-and-fire neurons, so nothing happens in the simulation.