Add new macros for print templates.

Add new macros for print templates.

%-TRIM%
Trims whitespace before the macro

%TRIM-%
Trims whitespace after the macro

%SUBSTR(#)%...%SUBSTR_END%
Take substring starting at position # to end of string.
If # is negative count backwards from end of string.

%SUBSTR(#,#)%...%SUBSTR_END%
Same as previous, but limit to second provided number characters after start point.
If second number is negative, count backwards instead of forwards.

TRIM macros inside of SUBSTR will be replaced first, then SUBSTR, then TRIM outside of SUBSTR.

Author: Thomas Berezansky <tsbere@mvlc.org>
Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>
Signed-off-by: Jason Etheridge <jason@esilibrary.com>
git-svn-id: svn://svn.open-ils.org/ILS/branches/rel_2_1@20138 dcc99617-32d9-48b4-a31d-7c20da2025e4