add distribution build script (for Ubuntu 64-bit)
initialize variables

obscure warnings from darwin cross-compiler
Merge pull request #336 from gordon/release

add distribution build script (for Ubuntu 64-bit)
typo
Merge pull request #337 from satta/master

typo - will not wait for travis on this one.
fix double free in sketch tool
Merge pull request #339 from satta/sketch_seqid_fix

fix double free in sketch tool
parse RF lines correctly in hmmscan output
do not 'clean' splint and scan-build targets

remove obj folder only if cleanup is called. this prevents splint and
scan-build to rerun every time make clean was used.
remove amalgamation.c on clean

closes #343
Merge pull request #344 from Garonenur/make

do not 'clean' splint and scan-build targets
allow visitors without feature node handlers

Closes #346.
Merge pull request #341 from satta/hmmscan_parse_fix

parse RF lines correctly in hmmscan output
Merge pull request #347 from satta/feature_visitor

allow visitors without feature node handlers