v0.3.0

Features

veman now reads the environment variable VEMAN_ENV_DIR which can be used to override which directory is used for managed environments.
The symlinks python and python3 in an environments bin folder were not replaced by default by the venv module when upgrading a venv, veman now delete the symlinks to ensure that new symlinks are created during an upgrade.
New option --all to the command veman upgrade to upgrade all existing venvs. The --all option can be used with or without existing options to the upgrade command.
New option --context to print system environment context (mainly used for debugging & testing).

Works on Linux, FreeBSD and macOS with Bash