- variables we do not need here moved to libpbuild.bash
- unset XXX_PATH, XFLAGS etc variables used by compiler and linker
instead of setting them to empty string
- pbuild::set:initial_env() and pbuild::cleanupenv() removed, code moved
to global scope
- start to use camel-case for global variables
- rename several non-constant capitalized variables to camel-case
- improve documentation
- pbuild::set_{build,runtime}_dependencies() removed
- cleanup
- introduce new functions 'pbuild::prep()' and 'build::patch_sources()'
- pbuild::build(): special handling of Darwin removed
- fixes and improvements in building dependencies
- reading file with versions removed
- version must be specified on command line
- write list of loaded modules as build dependencies
- for run-time modules: derive module version from loaded modules if not defined
- new command 'modbuild' to build modules
- separate bootstrapping from other build-blocks
- review BASH libraries
- adapt build-blocks in bootstrapping