Change date filter to work like the age filter does

[Ed McDonagh]

Will enable removal of the John Boxall gist

[Ed McDonagh]

Initial modification for CT filter date ref #52.

→ <<cset b481ad747446>>

[Ed McDonagh]

Initial testing works, but needs greater than or equal. This commit adds that. Refs #52.

→ <<cset 815fd584104d>>

[Ed McDonagh]

Added new style date filtering to mammo and fluoro, removed John Boxall filter from all three. Refs #52.

→ <<cset aabe783352ba>>

[Ed McDonagh]

CT xlsx export modified and tested for new dates. Refs #52.

→ <<cset f9688a769d4e>>

[Ed McDonagh]

CT, fluoro and mammo export via csv now changed to work with new date filter. Fixes #52.

→ <<cset 5c8ecbc8abe3>>

[Ed McDonagh]

John Boxall date filter gist no longer used and can be removed. Refs #52.

→ <<cset 6cbbda6286ef>>