Merge branch '2097_cleanup_master'

Merge branch '2097_cleanup_master'

* 2097_cleanup_master: (23 commits)
  Fixed errors and warnings in compilation stage.
  More accuracy of Diff Viewer conditiona compilation.
  Type accuracy in feed_subshell() function.
  Fixed messages of PCRE check.
  Ticket #2097: ChangeLog in its current form does not strictly make any sense
  Ticket #2127: updated file extension for "sh"
  vfs_timeout and use_netrc variables were moved to vfs.h file.
  Set maximum width of help window to 80 symbols.
  Minor optimization of show_version() function.
  Removed unused src/ecs* files and related stuff.
  Minor optimization of tty_draw_box() function.
  Removed uneeded extra assignment of command line complete flags.
  Changed function argument names.
  Fixed formatting after indentation.
  Ticket #1949: complete initialization of structures in src/args.c.
  Ticket #2041: check return value of g_strdup_printf() in mc_log().
  Ticket #2078: changed return value of init_translation_table() function.
  Use EXIT_FAILURE symbolic name as return code.
  Removed unneeded break after return.
  Ticket #2119: some trivial corrections.
  ...