PR 85 - Fix bugs #20467 and #14202

Hi,

I´ve create pull request 85 (https://github.com/bestpractical/rt/pull/87)
to solve the following bugs:

#14202 - now admins can change users
preferenceshttps://github.com/felipecrp/rt/commit/81ef0f8102bf130da6433205602b99bba9366542
#20467 - don´t add new records when natural dates (“tomorrow”,
"today…https://github.com/felipecrp/rt/commit/453df38b72c75a0a3760610c584cd9f3547ee69d
https://github.com/bestpractical/rt/pull/87#

Best regards,
Felipe