HPCC-12729 Redesign memcached plugin exception handling

Signed-off-by: James Noss <james.noss@lexisnexis.com>
Merge pull request #6759 from jamienoss/issue12729-rethink-ALL-memcached-wu-exceptions-5.2.0

HPCC-12729 Redesign memcached plugin exception handling

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
HPCC-12778  Fix libxslt package name
Merge pull request #6784 from xwang2713/HPCC_12778-2

HPCC-12778  Fix libxslt package name

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
Community Edition 5.0.4-rc9 Release Candidate 9

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge branch 'candidate-5.0.4' into candidate-5.0.6

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>

Conflicts:
	version.cmake
Merge branch 'candidate-5.0.6' into candidate-5.2.0

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>

Conflicts:
	cmake_modules/dependencies/trusty.cmake
HPCC-12665 Use a list to maintain a list of heaplets that may have space

* Add a doubly linked list of blocks to optimize removal

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>