qt: Allow appending a detached signature to an existing file
7d5df0bf0d86
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Description

qt: Allow appending a detached signature to an existing file

* lang/qt/src/qgpgmesignjob.cpp (sign_to_filename): Add argument
"appendSignature". Append new detached signature to an existing file if
requested.
* lang/qt/src/signjob.cpp, lang/qt/src/signjob.h (class SignJob): Add
member functions setAppendSignature, appendSignatureEnabled.
* lang/qt/src/signjob_p.h (struct SignJobPrivate): Add member
m_appendSignature.
* lang/qt/tests/run-signjob.cpp (struct CommandLineOptions): Add members
signingFlags, appendSignature. Initialize armor.
(parseCommandLine): Add command line options --detach-sign and --append.
(main): Do not exit if output file exists and append is enabled.
Pass new options to the job.

This change simplifies cross-signing a document by appending additional
detached signatures to a file with already existing detached signatures.