v2.13

• Clean up Makefile and example/Makefile, remove all GCC-specific and debug targets. Makefiles are compatible with both GNU and BSD make. As before, the shared target works only for GCC-compatible compilers. Thanks to Elliott Sales de Andrade for pointing out that shared library targets did not work with parallel builds, prompting this clean up.
• Support 128-byte record length by changing MINRECLEN to 128 (was 256). The current SEED specification is a minimum record length of 256-bytes, but there are cases (e.g. low latency data flow) using 128-byte records.
• Add declarations, casting and string truncation to clear warnings uncovered in ObsPy testing (thanks to Elliott Sales de Andrade).
• Add CYGWIN defined test to Linux section of lmplatform.h.