Import of czech wordlist

courtesy of www.oficialni.cz/slova
Tree builder - turns wordlist into searchable tree

Dumps the tree in python list format. Appears to be too big for practical use.
Tree builder generates binary file

Removed two abbreviations from the wordlist.
Furthermore, output file names can be passed to tree builder.
Removed inapropriate word
Tree builder: all output to stderr
Added .gitignore
Started java test program

NetBeans project included. The program parses the binary wordtree produced
by tree_builder and can use it to tell if a string is a valid word or a
perspective prefix.
Board generator and game solver

The generated boards are not very good, i.e. contain very few words
Board generation tweaks
Digraph counter added to tree generator

Digraph statistics will be provided to the client application to generate better boards.
Generating boards with conditional probablities based on digraph statistics
Small improvements

Added TODO list and file with words missing in the wordlist (not processed, yet).
Not sure: giving advantage to more common (less valued) letters in conditional letter generator.
Fixed bug: letters with 0 conditional probability would replace other letters in the roulette.
Debug output improved.
Removed obsolete commented code from tree builder
Added javadoc and unittests for Alphabet
Merge branch 'work'