Added a function to utils.py.
Fixed minor bug in holding of vcclamp in spontaneous mode and added -H option to step protocol.
Changed dynamicclamp to lcg in all example XML files.
Fixed bug in sinusoids.py script.
Merge branch 'devel'
Modified correlations script to add the possibility to perform current clamp experiments.
Added the possibility to use Gaussian stimulus in correlations script.
Fixed a couple of bugs.
Merge branch 'master' of https://github.com/danielelinaro/dynclamp
Modified correlation script to use arbitrary NMDA conductance. Kept the
old (and probably more correct) script in python/correlations_old.py.
Added initial condition in OU waveform and modified conductance rate
steps to use it.
Removed commented out lines.
Various changes to some python scripts.

-) Fixed bug with initial condition in OU waveform.
-) Added before and after stimulation times in rate_steps.
-) Modified fopt to not use a default XML configuration file.
Modified content of hashes.sha file.

The content of the file is now compatible with the check option of
the sha1sum utility.
Added Ornstein-Uhlenbeck entities.

The OU entity implements a stationary Ornstein-Uhlenbeck (OU)
process. The OUNonStationary entity implements a non-stationary
OU process, with mean and standard deviation specified by two
input waveforms. The autocorrelation time constant is fixed.
Work on OU entities and changes to sinusoids protocol.

The sinusoids protocol can now correctly use filtered rates for the
background conductances.
Fixed a few bugs in sinusoids protocol.
Default seed in OU* is now obtained from hardware.
Minor changes to ou_protocol.
Changes to writeStimFile in utils.py.

-) Added the possibility to specify the amplitudes of the preamble pulses.
-) Fixed a typo in kernel.py.