* version/2.0:
  Backported the recent changes from Ensembl's DBConnection

- use placeholders in "do" commands

bugfix [to ee51e74e] : restore the password-hiding functionality between beekeeper.pl and runWorker.pl

* version/2.0:
  The main index is docs/index.html

* version/1.9:
  The main index is docs/index.html

- always write the sequence to the current seqio - fix for creating lots of empty output files
- fix warning "Use of uninitialized value in subroutine entry"

- always write the sequence to the current seqio - fix for creating lots of empty output files
- fix warning "Use of uninitialized value in subroutine entry"

PR #5

(and probably RUNLIMIT as well)
The problem was in Queen::register_worker_death(). The code fetches the
current role, finalizes it, and then updates the worker table. The role
that is fetched from the database with fetch_last_unfinished_by_worker_id()
is not connected to any workers and later, when
AnalysisJobAdaptor::release_undone_jobs_from_role() needs to know the cause
of death and the number of work done by the worker, the role would load
another instance of the worker using the information currently stored in
the database, that is: before it has been updated.
Hence, the code was complaining that cause_of_death was not populated.
By associating the role to the worker, we allow the method to read the
existing information

This is done by setting "self_burial" to 0

* version/2.0:
  Added a link to the schema diagram in PNG

Conflicts:
	docs/hive_schema.inc

* version/1.9:
  Added a link to the schema diagram in PNG

* version/2.0:
  Added an HTML index for the workshop

* version/1.9:
  Added an HTML index for the workshop

* version/2.0:
  Updated the installation guide for 2.0
  Updated the Doxygen doc for 2.0
  Added the Doxygen documentation
  Added scripts documentation
  Added docs/index.html and use rawgit in README.md
  typo
  Include the CSS for the eHive HTML doc
  Doc update to please Doxygen
  bugfix: in each branch README.md will have to refer to its own version of docs
  adding reformatted install.html and README.md links to HTML documents (relying on htmlpreview functionality)

Conflicts:
	docs/hive_schema.html

* version/1.9:
  Added the Doxygen documentation
  Added scripts documentation
  Added docs/index.html and use rawgit in README.md
  typo
  Include the CSS for the eHive HTML doc
  Doc update to please Doxygen
  bugfix: in each branch README.md will have to refer to its own version of docs
  adding reformatted install.html and README.md links to HTML documents (relying on htmlpreview functionality)