Merge pull request #12 from esheldon/master

use visible attribute on plot objects
Merge pull request #14 from esheldon/master

removed incorrect warnings about global config; added try-finally blocks around compose operations for libplot
new plot function
got the spacing in the inline docs correct
Merge pull request #22 from nolta/new_simple_plotting

New simple plotting routines
removed old I/O routines

for issue #18
changed tabs to spaces
removed vim hook
removed another vim hook
yet another vim hook
changed file permissions
Merge pull request #23 from nolta/tabs_to_spaces

Tabs to spaces
updates to init to not import old functions and do 4 space tabs
and one more old reference
removed matlab plotting interface
converted biggles.py to new style classes and extended calling syntax