Change behaviour of REPL output and highlighting
* Narrow font-lock syntax highlighting to only the
active REPL input region.
* Mark REPL output read-only. This can be changed via the
option `geiser-repl-read-only-output-p`.
* Mark REPL output with a user-definable face as
`geiser-font-lock-repl-output`.
Alternatively an option to syntax highlight REPL output
is provided via the option `geiser-repl-highlight-output-p`.
This applies scheme-mode syntax highlighting to any REPL
output. Any additional hooks defined via scheme-mode-hook
are also executed for highlighting this region.
* Remove some unwanted TABs in source files.