- 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

library/md5.c

@@ -304,7 +304,7 @@ int md5_file( const char *path, unsigned char output[16] )
     unsigned char buf[1024];
 
     if( ( f = fopen( path, "rb" ) ) == NULL )
-        return( 1 );
+        return( POLARSSL_ERR_MD5_FILE_IO_ERROR );
 
     md5_starts( &ctx );
 
@@ -318,7 +318,7 @@ int md5_file( const char *path, unsigned char output[16] )
     if( ferror( f ) != 0 )
     {
         fclose( f );
-        return( 2 );
+        return( POLARSSL_ERR_MD5_FILE_IO_ERROR );
     }
 
     fclose( f );