* use base to make merging with bmo easier

* Revert "Bug 1497042 - Enclose table names in CREATE queries"

This reverts commit 62d5637a.

* refactor Bugzilla::DB to not subclass DBI

* use DBIx::Connector to manage database connections

* Ensure we always call DBIx::Connector->dbh before any DBI method

The code didn't allow a way of doing this without a lot of work.

So I had to take the following approach:
The 'dbh' attribute is now a method that delegates to DBIx::Connector's dbh
method. Per the docs, ->dbh() "Returns the connection's database handle. It will
use a an existing handle if there is one, if the process has not been forked or
a new thread spawned, and if the database is pingable. Otherwise, it will
instantiate, cache, and return a new handle."

Then there is the matter of the 'handles' on dbh. I've used Package::Stash to
insert proxy methods into the class when it is loaded.

* Bug 1328659 - Add support for utf8=utf8mb4 (switches to dynamic/compressed row format, and changes charset to utf8mb4)

* add deps

* add prepare_cached to the list of delegated methods.

This was added in bug 340160

* improve the migration to compressed/dynamic rows, skip views

* add missing semicolon

* remove pre-utf8mb4 emoji support

* fix small issue

* add debugging fatal error

r=dkl a=sgreen

r=dkl, a=glob

r/a=LpSolit

r/a=LpSolit

r=dkl, a=LpSolit

r=wicked a=LpSolit

r=dkl a=LpSolit

Bug 680131: Replace the MPL 1.1 license by the MPL 2.0 one in all files, and add it to files which miss one
r=kiko r=mkanat r=mrbball a=LpSolit

Bug 713144: The SQL query to remove older searches from the profile_search table should be more robust
r=dkl a=LpSolit

even Saved Searches get "last list" support.
r=LpSolit, a=LpSolit

Bug 600598: "Can't call method "bug_list" on unblessed reference" error thrown when editing a bug which is in the BUGLIST cookie but not in a recent saved search, with action="next_bug"
r/a=mkanat

Bug 578335: The "Show next bug in my list" user pref either doesn't display the next bug or display one from the wrong buglist
r/a=mkanat

are required for create(). It now assumes that any column that is NOT NULL
and has not DEFAULT in the database is required. We also shift the burden
of throwing errors about empty values to the validators. This fixes the bug
that Bugzilla::Bug->create() wasn't populating default values for fields
if they weren't specified in the create() parameters.
r=timello, a=mkanat

multiple buglists at once
r=glob, a=mkanat