closes#5506
The application of patches to upstream executables has been reworked
according to the suggestions of the main developer in #5506. In
particular we are not maintaining a dictionary that maps plumed
versions to the versions of patchable executables, and we are using a
non-interactive command to patch applications.
All the comments on substituting plumed at run-time do not apply here,
since we use RPATH and we want to maintain a 1:1 relationship between
the DAG hash and the plumed library used.
a3bbe066b3