[branch] Fixed some mistakes when passing (min, max)
bounds to the backend, and started passing constraints
to the backend.
[branch] Make NA values on bounds real NA values
(not logical NA values).
[branch] Added support for extracting bounds of free
parameters and passing them to the backend.
[branch] Added NA, NA as upper and lower bounds to all free parameters.
Removing build output from SVN repository.
removing multi-objectives branch and adding experimental branch.