added two scripts

Added scripts `exportlegends` and `log-region`, including init and
readme entries.  The init file now has a section for legends-mode
keybindings.
delete obsolete plugins, add notes +new dfstatus

The new dfstatus script needs some work on magic numbers before it moves
to the scripts folder; the notes file contains my notes on further
things to delete.
formatted notes, deleted more

went through `blame` and `history` to work out value of remaining stuff,
formatted notes for other people to read and deleted a few more plugins
fixed dfstatus script, readme and init entries

replaced magic numbers in dfstatus script with `df.item_type.TOKEN`;
added dfstatus to readme and init_example; myself to contributors list,
updated needs_porting notes and removed script
Handle missing arguments to filter/paint in tiletypes
Restore old terminal settings on segfault on OS X
replace all tabs with eight spaces

apparently an important style thing, which I missed
fixed whitespace in dfstatus script

all indents now use a uniform eight spaces; fixed from mix of four
spaces and tabs
actually fixed whitespace

to four-space indentations.  I should have read the documentation
earlier...
fixed whitespace again to four-space indentations

should have read the documentation before trying a style fix...
Merge branch 'tiletypes-blank-args' of git://github.com/lethosor/dfhack into develop
Merge branch 'segfault-reset-osx' of git://github.com/lethosor/dfhack into develop
Add to NEWS
Merge branch 'add-exportlegends-and-logregion' into develop
Add to NEWS
Merge branch 'cleanup-needs-porting' into develop