[Bug-wget] Conditional GET requests

[Hubert Tarasiuk]

Hello Everyone,

I have prepared conditional GET requests support for Wget (specifiaclly
If-Modified-Since header).

Following steps were taken (each is one patch):
1) local file timestamp support added to testenv
2) 304 return code added to testenv (ie. do not send response body when
304 was requested for given file)
3) Test-condget.py - unit test for conditional requests
4-5) "--condget" option handled in src/http.c
6) Short description in user manual

I would be very pleased if you could review my code and maybe point out
some mistakes or any other comments/suggestions. Maybe you have ideas
about some improvements to it?

In case you prefer to view it on Github, here is a link:
https://github.com/jy987321/Wget/commits/master-hubert

-- 
Hubert Tarasiuk

0001-Implement-timestamp-support-for-local-files-in-teste.patch
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0002-Support-conditional-GET-in-testenv-server.patch
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0003-Add-test-for-condget-requests.patch
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0004-Add-condget-option.patch
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0005-Prototype-of-If-Modified-Since.patch
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0006-Include-condget-option-in-user-manual.patch
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