Improved ui.edit(): - Use descriptive name for temporary file: hg-editor-*.txt - Don't import tempfile in the method, but use demandload() - Remove tempfile file even if editor aborts.

adding foo
adding bomb
adding a.c
adding dir/a.o
adding dir/b.o
! a.c
! dir/a.o
! dir/b.o
? .hgignore
a.c: unsupported file type (type is fifo)
! a.c