drop artifacts currently unavailable in m2 repo (for now)
update to 5.1-beta1 in ivy filenames
update to 5.1-beta1 in ivy revisions
consolidate artifacts lang-en-US and lang-en-GB to match actual marytts modules
add extended attribute to store artifact filesize
add descriptor for French language component
use virtual repository instead of custom repo for marytts artifacts
preliminary version of GroupLayout for Components
log view implementation