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A simple execution of tmp/invoke-rename.pl

The & 0xFF should not be necessary on platforms with 8-bit chars, but one user
reported having problems with his compiler on such a platform.

All symmetric cipher algorithms and hash algorithms now include support
for a POLARSSL_XXX_ALT flag that prevents the definition of the
algorithm context structure and all 'core' functions.
(cherry picked from commit 4087c470)

(cherry picked from commit eae09db9)

Conflicts:
	library/gcm.c

New padding checking is unbiased on correct or incorrect padding and
has no branch prediction timing differences.

The additional MAC checks further straighten out the timing differences.

 - Changed the behaviour of x509parse_parse_crt for permissive parsing. Now returns the number of 'failed certificates' instead of having a switch to enable it.
 - As a consequence all error code that were positive were changed. A lot of MALLOC_FAILED and FILE_IO_ERROR error codes added for different modules.
 - Programs and tests were adapted accordingly

 - Major type rewrite of int to size_t for most variables and arguments used for buffer lengths and loops