fixes various problems in TMW->Wylie Sanskrit conversion, viz.
800153 (Typing sara gets sra), 811282 (F10 of ragyada is rgyad),
and 811284 (F10 of gayarma gets ga.yarma).
Removed the last of the (dangerous, bogus) globally-declared
temporary variables.
Fixed bug in R+ (the code I had written did the wrong thing in a
complicated way; actually all that was needed was a single call to
InsertLatinOrTibetanLetter, which already did the right thing in a
simple way).