getting bibliography imports working

We have been having trouble with bibliography imports in xpapers. After trying to upload a bibtex bibliography we found that the page just hung saying it was initializing. After a lot of debugging this was found to be due to 2 reasons:

1. Bibutils which came precompiled with xpapers didn't work on our system. This was supposed to be compiled for an x86_64 architecutre (which I thought we were using). Perhaps it was a Gentoo/Debian incompatibility or a libc incompatibility. Anyway recompiling bibutils fixed this one.
2. Line 98 of assets/mason/utils/process_batch.pl incorrectly referenced /home/xpapers/var/log/batch.log, the logs directory is var/logs not var/log. Having this spelt wrong broke the submission process.