Merge branches 'schema_update' and 'estimation' of https://github.com/QRAAT/QRAAT into schema_update
Added t to build tree.

Accepts a UTC timestamp as its single command line parameter and
outputs a local time string. It has a stupid name.
Modified `rmg exporttx` to use new schema.
det -> DB processing for new schema.

(Needs test.)
Updated signal filter for new schema.

Needs verification. (Previous commit has been trested.)
Merge branch 'master' into schema_update
Modified rmg_dbstats for new db schema.
Merge branch 'cont_cov' of https://github.com/QRAAT/QRAAT into cont_cov