Fix wrapping handline

Several fixes to correctly handle memory wrapping:

• Bad in-place CP model for Conv and Pool (not enough margin, did not work with OpenMP);
• I/O offsets (usually named iOffset, oOffset) must stay signed, otherwise memory wrapping won't work (@pineapple);
• INPUT_MEM_STRIDE was used instead of INPUT_MEM_CONT_SIZE at some places;
• Wrapping was not handled by outputs save and cmp (@axelfarr);
• Fixed several signed/unsigned comparison warnings;
• Use size_t instead of int when possible.

This MR fixes sporadic failure of CI due to wrong computation in lenet.py with --mem_wrap argument.

changed milestone to %aidge v0.7.0

assigned to @olivierbichler

added 5 commits

• aabf86c2 - Fixed offsets signed
• de4f0ede - Make output save and cmp take into account wrapping
• 6c6c3961 - Fixed issues
• 304a6d5b - Fixed typos
• 6923a80c - Fixed in-place CP model for Conv and Pool

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changed title from Draft: Fix to Draft: Fix wrapping handline

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merged