Fix error reporting

moved init of stack variables to prevent error: jump to label ‘__label_9’ crosses initialization of ‘shape_%(cdna)s[nd]’

improved indentation, added exeption when not all inputs have the same ndims, tried to improve some memory / reference counting issues, removed initialisation of variable sized arrays, which causes problems under windows

See comment by nouiz: https://github.com/shackenberg/Theano/commit/d799afcae312ce973864ea8039b626c862ca93d2#commitcomment-3726133

Gh1461

This is needed to make the new GpuImages2Neibs ignore_border mode pass.

Also make sure the input is on the CPU, so a transfer is added when needed.

Tests

Fix a test error related type typenum of ulonglong and uint64 being different even if they are equivalent.

Minor fixes

Fix a crash on Mac OS when sys.prefix is different from its realpath