Another new puzzle! This one isn't particularly deep or complex

(solving it only requires matrix inversion over GF(2), whereas
several of the other puzzles in this collection are NP-complete in
principle), but it's a fun enough thing to play with and is
non-trivial to do in your head - especially on the hardest preset.

[originally from svn r5967]

Recipe

@@ -18,9 +18,10 @@ COMMON   = midend misc malloc random version
 NET      = net tree234
 NETSLIDE = netslide tree234
 MINES    = mines tree234
+FLIP     = flip tree234
 
 ALL      = list NET NETSLIDE cube fifteen sixteen rect pattern solo twiddle
-         + MINES samegame
+         + MINES samegame FLIP
 
 net      : [X] gtk COMMON NET
 netslide : [X] gtk COMMON NETSLIDE
@@ -33,6 +34,7 @@ solo     : [X] gtk COMMON solo
 twiddle  : [X] gtk COMMON twiddle
 mines    : [X] gtk COMMON MINES
 samegame : [X] gtk COMMON samegame
+flip     : [X] gtk COMMON FLIP
 
 # The Windows Net shouldn't be called `net.exe' since Windows
 # already has a reasonably important utility program by that name!
@@ -47,6 +49,7 @@ solo     : [G] WINDOWS COMMON solo
 twiddle  : [G] WINDOWS COMMON twiddle
 mines    : [G] WINDOWS COMMON MINES
 samegame : [G] WINDOWS COMMON samegame
+flip     : [G] WINDOWS COMMON FLIP
 
 # Mac OS X unified application containing all the puzzles.
 Puzzles  : [MX] osx osx.icns osx-info.plist COMMON ALL