cppcheck-1.53

No major new features. No major changes to the command line flags.

We have fixed many problems such as false positives, segmentation faults, etc.

We improved existing checks to detect more errors:
* type checking for format string parameters
* uninitialized variables
* bad std::string usage
* buffer overflow checking
* iterator used on different containers
* doublefree of pointer
* null pointers
* bad usage of isdigit/isgraph/isalpha/etc
* wrong usage of std::find
* more deprecated functions

For details, see this page:
http://sourceforge.net/apps/trac/cppcheck/milestone/1.53