Trac #14882: typos in backtrack.py
Trac #14838: correct link to cvxopt documentation
Trac #13857: symbolic minmax commentary
Trac #13857: reviewer patch
#14985: Let zlib 1.2.>=7 build on Cygwin.
#15001: Update to prerelease 1.1pre9.
Trac #15019: Fixing differentiation
5.11.rc1
5.11.rc1
Merge 'sage-5.11.rc1' into master
Merge branch 'master' into build_system
[FIXUP] 5.11.rc1: update git specific files

These currently include
 * VERSION.txt
 * package-version.txt
 * checksums.ini
Implement the Sage preparsing transformations using the new IPython transformation framework in IPython 1.0
Add initial string decorator implementation to match sage-cloud
Update to latest IPython (1.0 RC1)

The frontend module was deprecated, so changed all those imports to top-level imports.

The default_config_file_name variables were also removed in IPython commit 567bf7a08efa10921c42a163ce66499dd77467f8
fix the string decorator extension
Load the string decorator extension in Sage.
Ignore cell decorators---let IPython handle them.
disable default string decorators until they are ready
update spkg to ipython 1.0.0