Improve how we suppress hits

[devdanzin]

Currently fusil only supports adding the names of modules, classes, instances, methods and functions to hardcoded suppression lists, as a way of avoiding troublesome calls and repeated, uninteresting hits. It's also possible to pass module names to include as suppression in the command line:

fusil/fusil/python/__init__.py

Lines 62 to 67 in 8e2c584

	input_options.add_option(
	"--blacklist",
	help='Module blacklist separated by commas (eg. "_lsprof,_json")',
	type="str",
	default="",
	)

We should make it possible to ignore hits based on regex matching on the stdout contents. That way, we can filter out hits that mention source code lines and abort/segfault messages (that's what I manually do to deduplicate hits).

The regexes could be passed on the command line (accepting the same option multiple times) or read from a suppression file. The reason for suppressing a hit should be recorded in the logs.

This improvement is a prime candidate for supporting inclusions of regexes by plugins (#52).