Merge branch 'pb/test-use-user-env'

Teach "test_pause" and "debug" helpers to allow using the HOME and
TERM environment variables the user usually uses.

* pb/test-use-user-env:
  test-lib-functions: keep user's debugger config files and TERM in 'debug'
  test-lib-functions: optionally keep HOME, TERM and SHELL in 'test_pause'
  test-lib-functions: use 'TEST_SHELL_PATH' in 'test_pause'

diff --cc t/test-lib.sh
Simple merge