Change fileElem to comply with newer versions of boost (> 1.48).
Documentation changes.
When compiling the graph, add the weights if a relation appears more than once in the source file.
Add .gitignore file.
Change where to check for weight
dict: do not store headword vector.
create (and use) serialized graphs
Add --nopos option to compile_kb (necessary when serializing dictionaries without pos)
use unordered set instead a map in directory
Change data structure for wdict_pos_range, so it uses less memory.
common: optimize vectors when reading from stream.
wdict: compute overheads.
Change WDict structure so it has less memory overhead.
Introduce new vector class for holding dict entries.

The new wdict_vector has less overhead.
wdict: make it compile on a g++ ver 4.7.2
Remove output_semcor option.
csentence: Remove unused functions.
csentence: re-introduce some CWord functions (begin, end), which are used in disambgraph
csentence: big change in aw parsing function. Now "noppv" elements are dealed properly.
Add a "noppv" test in dotest input.