Basic type and conversion framework for pg-async

Broken, obviously, though dbrary compiles without Columns.
Update dbrary.Columns using new SQLRes classes
Start updating models; dbrary.SQL* improvements
A little more work; down to 156 errors
Add a missing file from before
Merge branch 'master' into pgasync
Rework and generalize macros.Maybe; documentation, etc.
New Age type, hopefully should simplify that stuff

Could more reasonably be called DayPeriod or something.
Joda is maybe too picky about dates to be useful.
Some messing about; considering a major change
Made DB "global", removed from site; improved SQL interface
Some more random work (checkpoint)
Misc work, mainly on measures

Tempted to merge in and finish new measures stuff now, but should wait
More work
More WIP

Back under 200 errors, but faced with the MeasureT inconformity problem
rearing its ugly head again.
More WIP on models

Back down to 170 errors.
More WIP

I've escaped models for the moment (which isn't to say they're done).
My approach for views will be to start by wrapping everything in
Async.get, then revisit each one later, I guess.  124 errors.
More WIP starting on views

Merged comment content of two nearly identical profile pages.
Started on controllers

Enough for tonight.  117 errors.
More controller work, not as much as I'd like

Down under 100: 99!
controllers WIP