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ZNC 1.7.1

Security critical fixes
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* CVE-2018-14055: non-admin user could gain admin privileges and shell access by injecting values into znc.conf.
* CVE-2018-14056: path traversal in HTTP handler via ../ in a web skin name.

Core
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* Fix znc-buildmod to not hardcode the compiler used to build ZNC anymore in CMake build
* Fix language selector. Russian and German were both not selectable.
* Fix build without SSL support
* Fix several broken strings
* Stop spamming users about debug mode. This feature was added in 1.7.0, now reverted.

New
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* Add partial Spanish, Indonesian, and Dutch translations

Modules
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* adminlog: Log the error message again (regression of 1.7.0)
* admindebug: New module, which allows admins to turn on/off --debug in runtime
* flooddetach: Fix description of commands
* modperl: Fix memory leak in NV handling
* modperl: Fix functions which return VCString
* modpython: Fix functions which return VCString
* webadmin: Fix fancy CTCP replies editor for Firefox. It was showing the plain version even when JS is enabled

Internal
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* Deprecate one of the overloads of CMessage::GetParams(), rename it to CMessage::GetParamsColon()
* Don't throw from destructor in the integration test
* Fix a warning with integration test / gmake / znc-buildmod interaction.