plowdown: add new module download variable MODULE_xxx_DOWNLOAD_FINAL_LINK_NEEDS_EXTRA

Array variable containing curl's additionnal switches used on final link download (by plowdown).

Edit: don't use += for arrays
core.sh (parse_attr, parse_all_attr): strict quoting pairing in sed expression
core.sh: add sha1() plowshare api
modules: sync from master (plowshare4)

5740aff mirrorcreator (list): fix, upstream modified
9d323b1 sendspace (download, upload): enable -a/--auth module option.
39f43f1 filepup_net (download): translate /info/ to /files/ in link
2db32bd filepup_net (download): add missing uri_encode
0a96c7e netload.in (download): get filename from official API
07df331 filepup.net: initial module with download & probe support
12da486 rapidgator (download): avoid pipe, fix error 141 (SIGPIPE)
5b97286 nakido: add basic probe support
c017514 180upload (anonymous download): fix, add solvemedia support
74d2962 fileover: new module with anonymous download
fb2d9db nakido (anonymous download): resume is not available
b91e010 upstore: add support for free account
98c8adb upstore: add support for anonymous upload
2ce9e5e upstore: add probe support
e029fff upstore: new module with anonymous download
9ec0a6c mediafire (extract_id): improve parsing of file/folder ID
c032c51 mediafire (list): add support for chunks
b7500e4 mediafire (extract_id): fix file/folder parsing in "probe mode"
48887a2 nakido: new module with anonymous download
a5612ef zippyshare (download): fix links without captchas
bba1bac modules (go4up, mirrorcreator, pastebin): proper usage of --count value
354a580 pastebin.com: new module with list support
5f4d7fd embedupload: cosmetics (doubles quotes to simple quotes)
431ec0a embedupload.com: new module with list support
c17dc9a mediafire: add support for /download/xyz/filename links
abb07bd letitbit: avoid 'printf -v'
203a726 letitbit (probe): rewrite, use official API
db56bbf letitbit (download): rewrite, site obfuscates free download form
18695e7 go4up (list): fix, upstream modified
c4988d6 mediafire (download): fix captcha handling, second try
178ebb8 uploaded.net (upload): add sanity check
1d64907 rapidshare (download): uri_decode (final) filename
7eae97a go4up (list): fix, upstream modified
30c46ae letitbit (download): check if premium account is out of credits
5aeeead mediafire (download): fix captcha handling
4d0eb2f mediafire (download): fix SIGPIPE/141 error
c9ae987 mediafire (download): fix - better captcha and redirect detection
35c18b9 letitbit (probe): fix - provide at least basic information
b6c1549 rapidgator (upload): update, anonymous upload no longer allowed