Update Windows installer

[zooba]

BPO	23260
Nosy	@larryhastings, @tjguk, @zware, @zooba
Files	23260_1.diff README.txt: Overview of the new installer 23260_2.diff 23260_3.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/zooba'
closed_at = <Date 2015-02-06.06:13:20.997>
created_at = <Date 2015-01-17.23:12:41.490>
labels = ['type-feature', 'OS-windows', 'release-blocker']
title = 'Update Windows installer'
updated_at = <Date 2015-02-06.06:13:20.996>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2015-02-06.06:13:20.996>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2015-02-06.06:13:20.997>
closer = 'steve.dower'
components = ['Windows']
creation = <Date 2015-01-17.23:12:41.490>
creator = 'steve.dower'
dependencies = []
files = ['37751', '37752', '37754', '37838']
hgrepos = []
issue_num = 23260
keywords = ['patch']
message_count = 7.0
messages = ['234203', '234204', '234214', '234217', '234628', '235463', '235464']
nosy_count = 6.0
nosy_names = ['larry', 'tim.golden', 'BreamoreBoy', 'python-dev', 'zach.ware', 'steve.dower']
pr_nums = []
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue23260'
versions = ['Python 3.5']

[zooba]

Updating the installer for better security and robustness. Large patch coming soon (just getting an issue number to put in NEWS).

[zooba]

Patch. I'm also revising Doc/using/windows.rst, but I don't want to delay the initial reviews.

I don't think this is perfect, but it works well enough for the first alpha (scheduled for 8 Feb), so I want to get it in and stabilised now rather than at the last minute. There'll be more features and work to do.

There's a README.txt file (which I'll attach next) that has an overview of the installer. It'll be worth reading that first before looking at the code.

And apologies if the code makes no sense. I'm happy to explain sections, but WiX is about 90% magic (and the rest is MSBuild magic) and so any explanation is likely to be unsatisfactory. I've been working with both of these pretty intently for the last few years and I still don't feel like I've mastered them...

[zooba]

As I expected, shortly after posting this I find a significant issue with the way the installer will work.

Expect a revised patch soon :)

[zooba]

New patch with some changes to how optional debug symbols and binaries are handled. (I misunderstood how a particular WiX feature worked...)

[zooba]

Updated patch, and hopefully it will make it into review this time.

I deliberately excluded the image for the using/windows.rst documentation but you can see it at http://imgur.com/CdQaBmp

[python-dev]

New changeset e7dbef447157 by Steve Dower in branch 'default':
Issue bpo-23260: Update Windows installer
https://hg.python.org/cpython/rev/e7dbef447157

[zooba]

Got about as many reviews as I expected, but the builds have been going fine and I want this checked in before alpha, so in it goes :)