Consider capping verrou_dd's delta list length

[HadrienG2]

A debug build of a C++ program can use thousands of symbols. In this scenario, verrou_dd's helpful printout of the list of deltas can become a nuisance, as it heavily clobbers the TTY and makes it hard to locate previous messages.

Since said messages become especially important in the new rddmin operating mode, I would propose the following:

• Cap the length of the "remaining deltas" printout to a reasonable length (say, 100 symbols), adding a "... and N more ..." indicator at the end of the list if this limit is reached.
• Allow the user to gain back access to the list of deltas when needed by either 1/allowing the length cap to be tuned via CLI options or 2/logging this information to a file, perhaps in dd.sym.

[lathuili]

The no-empty env variable VERROU_DD_QUIET reduces the output (not yet stabilized branch struct_rddmin)

[HadrienG2]

Another thing which helped here is the recent idea of only displaying symbols that feature FP instructions. In debug builds, I went from ~10k symbols to ~200, which is much more tractable already.