Skip PCRE tests on Windows

These constantly fail for silly reasons like line endings or
not having the French locale installed.

May as well just save a manual step and needing to refer people
to an easily-missed item in README.windows.md.
Backtraces: mark lineinfo with information about whether it was C code
Start developer documentation
Fix bounds error in forward-i-search
Bind remaining control characters in the search keymap

New functionality:
  ^L clears the display
  ^N and ^P iterate through the next or previous result
  ^G and ESC-ESC cancel search mode
  ^W erases the previous word to whitespace
Make pasting to the REPL more robust to syntax errors

All text including and following a syntax error is output together on one line.
Merge pull request #6689 from mbauman/smarter-paste

Make pasting to the REPL more robust to syntax errors
a couple formatting and cleanup issues
Merge branch 'master' of github.com:JuliaLang/julia
Merge pull request #6633 from JuliaLang/teh/backtrace

Backtraces: mark lineinfo with information about whether it was C code
use new Base's version of typeinf during bootstrap to cache more code
specialize on some tuple types. fixes #6670
Merge branch 'master' of github.com:JuliaLang/julia
Merge pull request #6642 from tkelman/patch-4

Skip PCRE tests on Windows
fix #6656
make countnz not depend on zero(T)

clarify docs for find(). closes #6528
remove Cbool from docs, as it does not exist (ref #6529)

I don't know what the calling convention is for C99 bool, so we'll have
to deal with this later.
fix #5876, static parameters in macro expansions
fix breakage from 118c02e4fa0e16179331edf85456c22c47da9da7
Fix #6693: Calculate correct length when pasting strings with multi-byte unicode characters