Resolve "clang compiler errors for MPI_AllReduce (-Wtype-safety)"

Closes #485

See merge request OPAL/src!303

Merge branch '488-clang-compiler-error-unmatched-template-parameter-const-centeringenum' into 'master'

Resolve "clang compiler error: unmatched template parameter `const CenteringEnum*`"

Closes #488

See merge request OPAL/src!302

Resolve "clang compiler error for VerticalFFAMagnet"

Closes #484

See merge request OPAL/src!299

Resolve "Compiler warnings from boost headers stops compilation"

Closes #483

See merge request OPAL/src!300

Resolve "Broken link in Readme"

See merge request OPAL/src!298

Resolve "What is the status of OPAL Map?"

Closes #464

See merge request OPAL/src!294

Use std::round(x) instead of std::floor(x+0.5)

See merge request OPAL/src!297

use c++11 std__math methods instead of own classes

See merge request OPAL/src!296

Resolve "`VALUE` command does not print variable names"

Closes #480

See merge request OPAL/src!295

Resolve "IPPL tests and Boost timer"

Closes #479

See merge request OPAL/src!293

Resolve "fix warnings with GCC 9.2 and -Wextra and some cleanup"

Closes #478

See merge request OPAL/src!292

Resolve "asciih5block not working with recent H5Hut library?"

Closes #469

See merge request OPAL/src!281

* Add new file from Hui Zhang with B-field and adaptive limits (possibly closer to original)
* Fix some comments
* Adhere to coding style
* Add BANDRF script to CMake
* Remove old script with hardcoded values to reduce duplication
* Make Efield and Bfield input optional

See merge request !281

Resolve "Missing include in Algorithms/bet/math/savgol.cpp"

Closes #477

See merge request OPAL/src!291

Resolve "missing include of <algorithm> and usage of std::minmax()"

Closes #476

See merge request OPAL/src!290

Resolve "cleanup: beam envelope tracker"

Closes #461

See merge request OPAL/src!273