libunwind support

backtracing is now done via libunwind by default (if available)
reduced multi-thread locking
greatly improved tracing speed (1.6x-3x or more depending on memory allocation pattern)

v0.3.0

code cleanup, fixes and usability improvements for easier analysis
added script for start a program under log-malloc2
added scripts for analysis of log-malloc trace file (leak discovery, memory usage)
added script for backtrace decoding (with ASLR support)
introduced new C API usable when log-malloc2 is directly linked to a program
added C INLINE API functions for easier backtrace printing
documentation improved

v.0.2.4

v0.2.4

little fixes - v0.2.4