cleaned out output of captured std.err
removing unnecessary ns ref in function call
Addressed expression print wrap issue (Fixes #4)

Well, probably only partly fixes #4, but addresses the
most prominent examples which is the spot where unitizer
shows the deparsed expression as they are being evaluted
removing assignment to global env
doc changes to pass R CMD check
changed access mechanism for backup search path

Original assignment to global env was just a bad idea
and caused warnings about over-writing all the time
cleanup/bugfixes for unitize

dealing with introduced problem with zero.env being part
of the unitizer package when writing to RDS, and cleaned up
summary stuff for non-interactive use
adding tests to see how search path errors handled in unitize
vignette on search path stuff
tests used to track down a section title bug, and bugfix
minor typo fix
improved management of search path manip failures

Now check both right after tests, and after everything is
complete
minor doc updates
minor cleanup of docs and display text
updating documentation