* In filter_readonly_variables(), replace 'declare -r ' with 'declare '

* In filter_readonly_variables(), replace 'declare -r ' with 'declare '
  instead of removing it completely.

* Bug #202068 - In order to filter unwanted variable assignments out
  of the bash environment, use a filter-bash-environment.py script
  that behaves similar to egrep -v except that it leaves bash here-
  documents intact.

* Use the sed -r option to enable extended regular expressions so that
  commonly used characters like (, ), and + don't have to be escaped.

(trunk r8890:8893)

svn path=/main/branches/2.1.2/; revision=8899