Fix off-by-one calculation issues in polar coord conversion

Image resulting from a rect -> polar -> rect conversion is no longer
offset.
Force a pause before writing XML data out to file

The new XML class is so much faster than the old INI calls, that
sometimes it generates file access errors because it attempts to open
the file before the OS has fully deleted it!  To mitigate that, DoEvents
is now used to artificially delay the write-to-file.
Add command bar to more tools

Seven more in this batch