update tests for the focused function monitor
cleanup
Add a FocusedLineMonitor
pep8 and pyflakes
update focused line and function monitor tests to use the function keyword
Add a focused line mixin and create the stumb classes for focused line
monitors
add a focused function mixin and provide stub classes for focused function
monitors
update api files
update documentation
WIP: support focused monitors in pikos-run
factor out function `get_function` to load and import the functions
update docstring