tree 6ded2cc02963c36a6d8e4610d5f3840ea08fbc33
parent 24c5a00073c97a3e524d8c0ceee18ad22077d1f0
author Junxiao Shi <git@mail1.yoursunny.com> 1544632534 +0000
committer Junxiao Shi <git@mail1.yoursunny.com> 1544632534 +0000

detail: move common.hpp to 'detail'

common.hpp and config.hpp are implementation details that should be
installed to target system.

common-pch.hpp is moved to 'impl'.

This commit also adds README.md to 'detail' and 'impl'
directories to explain their semantics.

refs #4782

Change-Id: I4f3e607338b3bdccbaddaed735f6326adcc2fda0