clean up considerably TraceGraph instant methods

get rid of pointless print

remove unused log file

pep8
Solve bug in parsing. Cache wasnt flush without any dvk trace
Catch ZeroDivision exception for empty graph
Ignore, for now, paths with a single call

squash this with the single call stuff...
add unittests and trace files for testing
pep8 and lint again

pep8 and lint for tests
BugFix: Stop parsing trace file upon getting Exception

mend
Seperately catch excetions related to unexpected end of file -- corruppted log
Remove/rename methods

Minor: Refactor tests
Posix calls list saved in file for fast reloading.

Minor:
Update argc/argv and config file to support this functionality.
Search patterns in posix call sequences; call them sloppy abstractions
Parse functions without name, based on offset and lib name.
Prepend caller in libc calls to filter patterns more efficiently.

Minor:
Some minor refactoring in methods
Include some additional statistics printing (Callers per POSIX call)
Tune threasholds to get everything printed
Add some plotting scripts
Update gitignore
Clean syntax according to pep8