multiupload: add (anonymous) download support

multiupload is a mirroring service but also hosts files.

+ fixes for upload
plowdown: drop -c/--check-link command line option

It is replaced by plowprobe.

Changes:
- modules: drop CHECK_LINK tests
- documentation updated
zippyshare: add upload account support

Dropped --private module command line switch because it does nothing!
Fixes issue 939.
core.sh (log_report_info): add $LIBDIR report
core.sh (captcha_process): 9kweu increase timeout

Add 30 more seconds..
10+6+6+7+7+8+8+9+9+10+10+20+20+20+30+30+30=240

Fixes issue 1010.
plow*: cosmetics, rephrase some help content
core.sh (captcha_process): 9kweu increase timeout [take 2]

Forget to see timeout parameter. In worst case, last curl request would get timeout error.

See first half:
revision cef1684996fb4e935147823b7c3cd417a07b40ab

Fixes issue 1010.
plow*: cosmetics, harmonize help usage message

Adoped "file sharing website" expression.
plow*: add --modules command line option to list available module names

Changes:
- as it is dedicated to wrappers scripts --module has not been added to bash completion
- man pages documentation updated
- plowdown: drop --get-module command line option. Use plowprobe --get-module instead
multiupload (upload): add --count module command line switch
ultramegabit.com: new module

Fixes issue 1006.
plowlist: when --fallback is used, exclude links from same domain url (given as argument)
core.sh (basename_url): doc fix
man page (plowprobe.1): minor, reorder --follow and --get-module options
gamefront: new module

Fixes issue 764.
sendspace: fix sendspace_login()
solidfiles: new module
billionuploads: fix, upstream changed
filecloud: new module

This hosting provides an API http://code.google.com/p/filecloud/
Some functions are yet to be implemented (tags and private flag setting) and
regular downloads cannot be processed by API (only premium). So module is
somewhat hybrid. API key is the same as auth cookie, so API is used to login.

Fixes issue 552.
Merge branch 'master' into luckyshare

Conflicts:
	src/modules/config