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Make style of output capture uniform

Dmitry Bogatov requested to merge KAction/Surfraw:use-posix-output-substitution into master

There is two ways to capture output of command in shell scripts:

  • command args
  • $(command args)

Both are supported by POSIX and all shells in wide use (except of Solaris /bin/sh) but second one is simplier to read, especially in case of nesting.

Surfraw project already uses both form, so changing all code to use single, more modern and readable form, do not cause loss of portability.

Since currently codebase already uses both forms, POSIX-compatible shell is already required. Also, `HACKING' file is modified to suggest new form of command output capture.

For more information about two forms of output capture, see https://stackoverflow.com/questions/9449778

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