Is #673 - Revert 350f7b4 and 86e62db AdjustConfig logic

[geoffmcl]

While these look like a code cleanup, they appear to have an adverse consequence in the use of libtidy by PHP 7+, so have been reverted. Changes in -

modified:   src/config.c
modified:   src/config.h
modified:   src/tidylib.c

As indicated while these look like seemingly innocuous changes in AdjustConfig logic, it has caused some very undesirable changes... see #704 for more details...

As stated in #673, unless a better fix is found will consider merging the issue-673 to next...

Look forward to further feedback... thanks...

[geoffmcl]

This seems related to #780 - looks like a prob. with wrap => 0, which seemed broken in 5.6, fixed in 5.7.9, and so is in current next...

If someone had the time to cherry pick this fix back into the 5.6, and issue a 5.6.1 release, that would be great...

But given that we have some difficulty in making a new release 5.8, or 6.0, given #743, that does not seem likely to happen... I don't know how to fix that... see stalled #741...