initscript: remove unnecessary backslashes in variable definitions
initscript: replace environment variables with more standard upper-cased names
initscript: make a TWISTD_PATH environment variable to replace hard-coded /usr/local/bin/twistd
initscript: pull environment variables together into one block
initscript: move HOME variable up to environment variable block, remove unnecessary double-quotes
initscript: add LSB (Linux Standards Base) 3.1 compliant header