remove old test_runner
we do not need to make pear package
e in preg_replace is deprecated in PHP5.5
e in preg_replace is deprecated in PHP5.5
Merge branch 'remove_preg_replace_e' into cheese
remove Pear related subcommands
ClearCache does not call PearWrapper since commit 66ddaada22dc503b102a8bec8e942cb4296df62f
PearLocal command is removed
not required
PearWrapper is not called any more
simpletest is not used any more
there is no such case as $PWD matches root directory because we do not use PEAR.
forget PEAR and handle composer style path
env PHP_CLASSPATH is not used at all
simplify
add --debug option to set -x
set ETHNA_HOME by the path of  ethna.sh file
indent
refactor
remove simpletest-style test generator