Little hack in reshape() function to set the tag.shape of the output if the new shapeis a tuple or list.

variable.tag.shape

This allow to use GpuElemwise with the modulo operator

BEHAVIOR FIX: flag of type bool WAS taking the value false for the empty string and true for everything else.

Now we only accept string False, false and 0 as false and True, true and 1 as true.

new optimization for scan to be smarter about memory allocation .. plus a few notes in the documentation

integers.  Obvious example - numpy.int* and numpy.uint* objects.

upcasted constants into explicitly upcasted constants so that the MergeOptimizer
can work on them, and various other optimizers work later on in the optimization process.

Done to fix instability in SdA

Fixed assert in local_subtensor_make_vector. ShapeFeature's unpack now deals with numpy.integer as well.