secutiry: make sure stringify() always produces perl-parsable structures, so that global settings of Data::Dumper do not affect its results (thanks to Uma and Matthieu for reporting)

added a new per-analysis "analysis_capacity" limiter for cases where users want to limit analyses independently

switch the Scheduler to using universal Limiter objects (cleaner code, more precise computation and should allow for expansion)

moved pending adjustment out of the main scheduling subroutine, which simplified the logic and improved readability

Introduced a new 'NO_ROLE' cause_of_death for failures during specialization (not so much of an error, really!)

bugfix: avoid specializing in an otherwise BLOCKED analysis that is temporarily in SYNCHING state (thanks to Kathryn for reporting)

(multi-meadow scheduler) restrict the set of analyses that a worker with a given meadow_type can specialize into

bugfix: if re-running a job that creates a semaphored group, we no longer die (thanks Miguel for reporting)

Added API and schema support for analysis_base.meadow_type / Analysis->meadow_type(), which will be NULL/undef by default

make Valley into Configurable and move SubmitWorkersMax into Valley's context, because it is more "global" than a Meadow

simplification of the interface: scripts no longer understand --user/--password/--host/--port/--database and require --url instead

capture Worker's death message during the new 'SPECIALIZATION' status in job_message/msg (thanks, Thomas!)

feature: jobless workers will now leave module compilation errors in the job_message table (thanks, Kathryn!)

bugfix: worker.log_dir varchar(80) was too limiting, now extended to varchar(255); (thanks, Kathryn!)

bugfix: make sure we release claimed jobs from a manually-run worker whose Runnable fails at compilation (thanks, Miguel!)