IDEAS: List of possible changes or features in lpe

These are particularly interesting ideas that I haven't yet decided to do.  If
there is interest in any of them, I may move them into the TODO list and then
implement them.

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- Multiple buffer support

Allow the user to have multiple open buffers, which they can switch between
using next and previous buffer commands.  Modify open to add a buffer to the
list, and add a close command to close a single buffer, and a command to save
and close a single buffer.  This won't be too difficult because I designed
around this possibility.  I still have to decide if I want to do it though.

- Regular expression search

Just a thought, because S-Lang supports it, so it wouldn't be too difficult,
nor would it require dependencies of some external regexp library.  Then again,
I'll never use it, so this is a thought that will most likely recur only if
someone asks me to do it.

- Avoid the Tab/Backspace mismatch in soft tab mode

Ways of doing this are all hacks, and I am hesitant to implement them.  Still,
some people may want them to happen, and I can't ignore users completely. :)
One idea might be a third tab mode that stores hard tabs while editing, but
replaces the tabs with spaces before saving.  Then, when opening a file, any
sequence of n spaces, where n is the soft tab width, would be replaced by a tab
while editing.  That's messy, but accomplishes most of the goals.