New profile: hledger/hledger-ui

[amano-kenji]

https://hledger.org/

Relates to #6580.

[kmk3]

Both profiles are nearly identical, so I don't see a need for a -common
profile.

To simplify it:

• Move hledger-common into hledger
• Make hledger-ui redirect to hledger
• Remove hledger-common

[kmk3]

Can you try to add private-etc entries to the new profiles?

You can check what paths a program tries to access with --trace=.

Example:

firejail --trace=trace.txt /usr/bin/foo

The output in trace.txt should contain the relevant /etc paths.

Other than program-specific files, generally a profile will have private @network,@tls-ca if it needs internet access and private-etc @x11 if it has
a GUI.

See src/include/etc_groups.h for the other groups.

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Also, #6593 was merged and it catches (among other things) a missing newline at
EOF (which affects some of the open PRs), so please rebase all PRs to master.