Additional random-access statistics

[SSoelvsten]

Looking at the results, we may also want the following statistics?

node_file / arc_file

• The number of elements pushed/read to/from each index.
• The number of times a semi-transposed file needed to have its out-of-order terminals sorted.

[SSoelvsten]

Weirdly enough, there seems to be some issue, where the internal functions of Adiar are using the compilation of the public API placed within the client executable, e.g. the unit testing script. The issue here is, that the client may not compile with statistics enabled, leaving some parts of the desired statistics not properly updated.

See the full issue here: #506 .