homo_sapiens/patch/transcript.txt: SQLite does not like header.
exon.t: ignore 'datatype mismatch' bind errors on floating point for SQLite.
dbEntries.t: correct offset in SQLite auto-increment munging.
travis.yml: add DB=sqlite to env matrix.
Travis: set up SQLite config; fix matrix.
Travis: install DBD::SQLite.
harness.sh: skip some tests under SQLite.