added libsvm format
revived label field from sally
changed type to bit-field
fixed weird overflow in bit-field
fixed broken printf in output
changed str struct to save space
preproc function
added note about locking
fixed description
updated TODOs
added missing code from sally
renamed source file with config functions
improved progress bar
added note about regex
moved preprocessing functions
rewrote stopword filtering
usual code beautification
updated manual
symmetrization will be treated separately