Log Message:
tex-fancyhdr{,-doc}: update to 4.0.1

Version 4.0 is a significant rewrite of the package.

 Backward incompatible changes:
 - Eliminate adjustments of \headheight or \footskip, when the header
   or footer is too high.
 - All definitions of the header/footer fields are now local, no longer
   global.

 New features:
 - Package option compatV3 to keep the old behaviour, i.e. the changes
   mentioned above are not applied (not recommended).
 - Package option nocheck, to completely eliminate the check for header
   and footer heights (not recommended).
 - Package options headings and myheadings to redefine these page styles
   with fancyhdr.
 - New page style fancydefault.
 - New parameter \headruleskip.
 - New commands \fancyheadinit, \fancyfootinit, \fancyhfinit and \fancycenter.
 - \fancypagestyle has an optional parameter [⟨base-style⟩].

 Extensive rewriting of the documentation.

4.0.1
Some documentation corrections.