Log Message:
Update PEAR to 1.9.1.

pkgsrc changes,
* Update base pear packages:Archive_Tar-1.3.7 (recommented)
* Remove ${FILESDIR}/pear.sh, same as bundled one.
* set LICENSE=2-clause-bsd
* add user-destdir support

Upstream Changelog:

* svntag improvements, tag package files passed into the command and better
  directory checks [dufuz]
* rely on Structures_Graph minimum version instead of recommended version
  [saltybeagle]
* Fix Bug #12613: running go-pear.phar from C:\ fails [dufuz]
* Fix Bug #14841: Installing pear into directory with space fails [dufuz]
* Fix Bug #16644: pear.bat returns syntax error when parenthesis are in install
  path. [dufuz] [patch by bwaters (Bryan Waters)]
* Fix Bug #16767: Use of Depreciated HTML Attributes in the Exception class
  [dufuz] [patch by fuhrysteve (Stephen J. Fuhry)]
* Fix Bug #16864: "pear list-upgrades -i" issues E_WARNINGS [dufuz] \ 
[patch by
  rquadling (Richard Quadling)]
* Fix Bug #17220: command `pear help` outputs to stderr instead of stdout
  [dufuz]
* Fix Bug #17234: channel-discover adds port to HTTP Host header [dufuz]
* Fix Bug #17292: Code Coverage in PEAR_RunTest does not work with namespaces
  [sebastian]
* Fix Bug #17359: loadExtension() fails over missing dl() when used in
  multithread env [dufuz]
* Fix Bug #17378: pear info $package fails if directory with that name exists
  [dufuz]