Two hashtables have been added to store the spellers currently used (in all
buffers) and info for each buffer: array with pointers to spellers and state of
aspell for this buffer.
Therefore the spellers are not destroyed and created again on each buffer switch,
or each time screen is refreshed when window is split.
New options in command /aspell:
- "enable": enable aspell
- "disable": disable aspell
- "toggle": toggle aspell
Options renamed in command /aspell:
- "enable" renamed to "setdict" (set dictionary for current buffer)
- "disable" renamed to "deldict" (delete dictionary used on current buffer)
- "dictlist" renamed to "listdict" (show installed dictionaries)
