Scripts in `bin` and their purpose

Programs run via autogen.sh (or the equivalent in CMake) are indicated.

Program	Purpose
`buildhdf5`	Convenience script to build HDF5 using the Autotools
`checkapi`	Checks if public API calls are used in internal functions
`chkcopyright`	Checks if files have appropriate copyright statements
`cmakehdf5`	Convenience script to build HDF5 using CMake
`debug-ohdr`	Examines debug output from `H5O_open/close` to look for open objects
`format_source`	Runs `clang-format` over the source files, applying our rules
`genparser`	Creates the flex/bison-based parser files in the high-level library
`h5cc.in`	Input file from which h5cc is created
`h5redeploy.in`	Input file from which h5redeploy is created
`h5vers`	Updates the library version number
`make_err`	Generates the H5E header files (called in `autogen.sh`)
`make_vers`	Generates H5version.h (called in `autogen.sh`)
`make_overflow`	Generates H5overflow.h (called in `autogen.sh`)
`output_filter`	Used in the tools test code to strip extraneous output before we diff files
`restore.sh`	Removes files generated by `autogen.sh`
`runbkprog`	Used by CMake to run test programs in the background
`switch_maint_mode`	Switches maintainer mode on/off in `configure.ac`
`trace`	Updates `H5ARG_TRACE` macros in H5ES_insert() calls (run by `autogen.sh`)
`warnhist`	Generates compiler warning statistics for gcc/clang when fed output of make

TODO

chkcopyright is currently semi-broken as it doesn't handle the full variety of copyright headers we need. We're leaving it in place, though, in the hopes that someone will update it in the future.
Extending warnhist to better understand the output of additional compilers/languages would be nice.