Rather than testing the Ant build under multiple JDKs, I've arbitrarily
decided to test it only under openjdk7.  This keeps us to 4 builds
rather than 6 before the build is reported as green which should be a
bit quicker.

ant builds copy everything in the pwd into ant_build and then try to
build all of the java files copied, including those of the dependencies
which are built separately.  This does not end well.

We don't

actually clone the history attribute

add support for eupathdb_uc user comment attributes

Added uORF, sORF and tnaORF as extra keys

extend escaping in qualifier values

Added AUTHORS file

Added LICENSE

simplify regex for user comment scraping

add tritryp_uc attribute to GFF3 export

do not always strip 'term=' from product

add user_data_min and user_data_max flags

allow user plots scaling to be controlled with user_scaling_on