PolMine/RcppCWB v0.2.7

RcppCWB 0.2.7

• If glib-2.0 is not present on macOS, binaries of the static library and header files are downloaded from a GitHub repo. This prepares to get RcppCWB pass macOS checking on CRAN machines.
• A slight modification of the C code will now prevent previous crashes resulting from a faulty CQP syntax. The solution will not yet be effective for Windows systems until we have recompiled the libcqp static library that is downloaded during the installation process.
• A new C++-level function 'check_corpus' checks whether a given corpus is available and is used by the check_corpus()-function. Problems with the previous implementation that relied on files in the registry directory to ensure the presence of a corpus hopefully do not occur.
• Calling the 'find_readline.perl' utility script is omitted on macOS, so previous warning messages when running the makefile do not show up any more.