Remove band-aid to wake stopped threads.
change names of create_mountlist env_process parrot_pack
create_mountlist becomes parrot_package_run;
env_process becomes parrot_package_env;
parrot_pack becomes parrot_package_create.
unify parameters of parrot_package_*; add more functions into parrot_package_run
change the preservation solution of environment variables
add --env-list parameter to parrot_run
change env-path parameter of parrot_package_create to env-list
remove 'parrot_package_env', merge its function into parrot_package_run.
add existence test of env-list and name-list parameters
add short versions for --name-list and --envlist parameters of parrot_run
add parameter exsitence check for parrot_package_run
adjust the location of time log of parrot_package_create
change parrot_package_* documents