v2.14

• Fix memory leak when msr_pack() returns after an error. Patch contributed by Larry Baker and Eric Thomas.
• Change casting of values passed to isdigit() to int instead of unsigned character. Apparently this was confusing on ARM systems.
• Add ms_readleapseconds() and ms_readleapsecondfile() routines to read a leap seconds file into an internal list.
• Modify msr_endtime() to check for an internal leap second list, check for overlap with the record and adjust the end time as needed when leap seconds are present. When a leap second list is present any indication of positive leap seconds in the fixed section data header are ignored.
• Add casting to size_t and int to avoid build warnings on certain build systems (e.g. older MS Visual Studio). The effective maximum sample buffer and record buffer size is ~2GB.