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Length indication when given a too small buffer was off.
Added regression test in test_suite_pem to detect this.

Used to work only for RSAPrivateKey content, now accepts ECPrivateKey too,
and may even work with similar enough structures when they appear.

More fixes based on the compiler directives -Wcast-qual -Wwrite-strings
-Wmissing-prototypes -Wmissing-declarations. Not everything with regards
to -Wcast-qual has been fixed as some have unwanted consequences for the
rest of the code.

(cherry picked from commit ff3a4b01)

After header and footer are read, pem_read_buffer() is able to determine
the length of input data used. This allows calling functions to skip
this PEM bit if an error occurs during its parsing.
(cherry picked from commit 9255e830)

(cherry picked from commit eae09db9)

Conflicts:
	library/gcm.c

 -  Added permissive certificate parsing to x509parse_crt() and x509parse_crtfile(). With permissive parsing the parsing does not stop on encountering a parse-error

 - A error_strerror function() has been added to translate between error codes and their description.
 - The error codes have been remapped and combining error codes is now done with a PLUS instead of an OR as error codes used are negative.
 - Descriptions to all error codes have been added.
 - Generation script for error.c has been created to automatically generate error.c from the available error definitions in the headers.

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

 - Parsing of PEM files moved to separate module (Fixes ticket #13). Also possible to remove PEM support for systems only using DER encoding
 - Parsing PEM private keys encrypted with DES and AES are now supported (Fixes ticket #5)
 - Added tests for encrypted keyfiles