org-agenda.el (org-agenda-format-item): Don't add the 'effort and 'effort-minutes...

org-agenda.el (org-agenda-format-item): Don't add the 'effort and 'effort-minutes text properties

* org-agenda.el (org-agenda-format-item): Don't add the
'effort and 'effort-minutes text properties as they are
already accessible through the 'txt property of agenda lines.

* org-clock.el (org-clock-in): Refresh both the 'effort and
'effort-minutes text properties.

* org-rmail.el (rmail, rmail-file-name): Silent byte-compiler.

* org.el (org-refresh-properties): Allow to set several text
properties by passing an alist to the TPROP argument.
(org-set-effort, org-property-next-allowed-value): Use 'effort
instead of 'org-effort.
(org-agenda-prepare-buffers): Update both 'effort and
'effort-minutes.
(org-mark-jump-unhide): Move up to silent the byte-compiler.