Merge pull request #6 from cvlmtg/master

2 fixes and 1 enhancement
directory copying improved
Do not clobber default register when initializing tree buffers
Do not set 'winfixwidth' if window will be reused for selected buffer (e.g., 'edit here', as with 'EasyTreeHere')
Merge pull request #9 from jeetsukumaran/master

Do not clobber default register when initializing tree buffers and do not fix window width when re-using working buffer windows
typo fixed
toggle command added, open function reworked
toggle related bug fix
toggle double related bug fixed
Merge remote-tracking branch 'upstream/master'