doc updates
interactive messaging cleanup
review menu order now in order of test file

Used to be displayed in the order that it would be offered
for review by unitizer, which is by section / sub-section
instead of order of test file.
tweaked screen output
now reload packages with 'warn.conflict=TRUE'

This prevents all those warnings when packages that
'overwrite' objects are re-loaded since those warnings
should have already been seen by the user when they loaded them
changed 'search.path.clean' default to TRUE
updated tests for changes in review menu
Clearer guidance for what do with failed test (Fixes #7)
moved 'unitizer_core' to different file
small bugfix for unreviewed alert
Merge branch 'misc' into development

Lots of miscellaneous fixes: issues #7, #14, #16, #22
renamed get/set_store to get/set_unitizer
adding 'unitize_dir'
Implement 'unitize_dir' (Fixes #24)
Merge branch 'development' into misc
fixed parse problem for demo
Address small navigation issues (Fixes #30)