I reverted a change around the Isyn = 0; line in generate neuron Function to synchronize between what's done with neuron Kernels and neuron functions and make sure that if for example TRAUBMILES is used without synapses there are no errors (TRAUBMILES coe contains Isyn, so it must be defined even if it's not used for synaptic input).
Some fixes in the user manual and annother tutorial added.
Modified the PoissonIzh model according to the most recent version.
Poisson behaviour is still to test warnings to be cleared.
Added parenthesis around parameter for substitution to avoid errors with
operators before negative values.
Added versions of addNeuronPopulation and addSynapsePopulation that accept vectors instead of C arrays for parameters and initial values.
Merge remote-tracking branch 'origin/development' into nrn_var_que

Conflicts:
	lib/src/generateRunner.cc