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Bugfix release to address pressing issues

• Fixed a critical segfault that may happen all the time!

FTP:

• fixed regressions
• fixed compatiblity with some broken servers
• detected but missing server features are disabled if error code = 500

closes #144 (crashes after gftp 2.9.0b)

The project is now under the MIT license

FTP protocol:

• FTPS: support implicit TLS (new protocol: FTPSi)
• support MLSD
• fixed IPv6 support
• new option 'ip_version' (any/ipv4/ipv6) [default=any]
• fully implement rfc2428 (EPSV, EPRT)
• automatically determine when to use PRET
• (these features are only used if the server explicitly supports them through the FEAT response)

GTK UI:

• fix crash with file transfers in active mode
• new option: gFTP->Preferences->Network -> IP Protocol

closes #120 (should use MLSD when the server supports it) closes #127 (implicit TLS) closes #130 (license change) closes #136 (segfault after file transfer) closes #140 (IPv6 is broken)

see git log for more details

• Fixed some important crashes - increases app stability
• Support compiling with OpenSSL 1.1 (FTPS)
• restore FSP support
• FTP: Removed the 'dont_use_proxy' stuff (broken)
• FTP: LIST -a is disabled by default (go to gFTP->Preferences->FTP)
• FTP: Add option to enable/disable proxy (disabled by default)
• GTK UI: Tweaks, adjustments
• GTK UI: Ctrl+Alt+C: toggle colored text in log window (disabled by default) also see menu gFTP->Colored messages...

See the git log for more details

• Some minor tweaks and improvements to the GTK UI (speciallly the bookmarks dialog)
• Improve/speed up the autotools build system a bit
• SSH2: detect if the server sends (yes/no/[fingerprint])

See the git log for more details

Highlights:

• SSH2: recognize more ssh server responses
• GTK UI: fixes / tweaks
• Some minor cleanups
• Ongoing effort to add GTK3 support
• Support GTK 2.14+
• Translations desperately getting out of date

Highlights:

• removed GTK1 support
• removed HTTP support (broken)
• removed FSP support
• various bug fixes, cleanups and improvements
• requires gtk 2.24 / glib 2.32+
• ongoing effort to add GTK3 support
• about a dozen language translations were updated