Add note and xrefs to User's Guide chapters explaining restrictions
using the Win32 API.
* new-features.sgml (ov-new1.7.6): Add note about Win CWD.
* overview2.sgml (ov-hi-intro): Add note and xrefs about Win32 API
restrictions. Tone down flexibility.
* pathnames.sgml (pathnames-intro): Add xref to pathnames-win32-api
section.
(pathnames-win32-api): New section describing Win32 CWD restriction.
* setup2.sgml (setup-env-ov): New sub-section.
(setup-env-win32): Ditto, describing Win32 environment restriction.
* faq-api.xml: Add FAQ entry "Why do some of my old symlinks don't
work anymore?"
* new-features.sgml: Fix symlink text. Add new UTF-16 symlinks.
* overview2.sgml: Add text about new UTF-16 symlinks and potential
problems with old symlinks.
* pathnames.sgml: Fix typo.
* setup2.sgml: Extend text about problems with symlinks.
* textbinary.sgml: Ditto. Rephrase certain paragraphs to match
Cygwin 1.7 behaviour. Add popen(3) and pipe(2) behaviour. Make
quite clear that binmode is preferred. Add *mode.o files to
description for developers.
cygserver and its relation to the "Bad system call" error.
* faq-setup.xml (faq.setup.uninstall-all): Mention postgresql.
* overview2.sgml: Update security info on shared memory.
* setup-net.sgml: Add "internet-setup" id anchor.
* overview.sgml: Update "What is it?" section. Add links to
"Is it free software?" section. Update "Brief History" section.
* overview2.sgml: Rewrite "Expectations for {Windows,Unix}"
as "Quick Start for those more experienced with {Windows,Unix}".
