Updates to Indivtasks()

- added a new Boolean argument to each function, indiv, which is set to
False by default but is set to True when that function is called
individually from within the individual tasks submenu. This prevents
some minor errors regarding the usage of custom dictionaries, and will
allow for individual- and interactive-based program changes in the
future.
- fixed a few other minor errors which prevented fullreduce() from
running all the way through.
- specidentify and specrectify still require changes because the reddest
wavelengths (in gr-angle=20.00 but not gr-angle<20.00 images) maintain
curved sky lines, i.e., no rectification is being applied.