cpdb-libs 2.0b1

[tillkamppeter]

First beta release for cpdb-libs 2.0.0

• Added interfaces to get human readable option and settings names
  Print attributes/options and their choices are usually defined in a machine-readable form which is more made for easy typing in a command line, not too long, no special characters, always in English and human-readable form for GUI (print dialogs), more verbose for easier understanding, with spaces and other special characters, translated, ...
  Older backends without human-readable strings can still be used. In such a case it is recommended that the dialog does either its own conversion or simply shows the machine-readable string as a last mean.
• Added get_media_size() function to retrieve media dimensions for a given "media" option value
• Support for media sizes to have multiple margin variants (like standard and borderless)
• Support for configurable user and system-wide default printers
• Acquire printer details asynchronously (non blocking)
• Made cpdb-libs completely CUPS-neutral
  Removed CUPS-specific functions from the frontend library functions and the dependency on libcups, renamed CUPS-base function and signal names
• Use const qualifiers on suitable function parameters
• DBG_LOG now includes error-message
• Renamed all API functions, data types and constants
  To make sure that the resources of libcpdb and libcpdb-frontend do not conflict with the ones of any other library used by a fronte or backend created with CPDB, all functions, data types, and constants of CPDB got renamed to be unique to CPDB.
  Here we follow the rules of CUPS and cups-filters (to get unique rules for all libraries by OpenPrinting): API functions are in camelCase and with cpdb prefix, data types all-lowercase, with _ as word separator, and constants are all-uppercase, also with _ as word separator, and with CPDB_ prefix.
• Renamed and re-organized source files to make all more standards-conforming and naming more consistent.
• All headers go to /usr/include/cpdb now: Base API headers cpdb.h and cpdb-frontend.h, interface headers (and also part of the API) backend-interface.h and frontend-interface.h, and the convenience header files backend.h and frontend.h (include exactly the headers needed).
• Check settings pointer for NULL before freeing it
• NULL check on input parameters for many functions
• Fixed incompatibility with newer versions of glib. glib.h cannot get included inside 'extern "C" { ... }'
• Corrected AC_INIT() in configure.ac: Bug report destination, directory for make dist.
• README.md: Fixed typos and updated usage instructions
• Updated .gitignore

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This discussion was created from the release cpdb-libs 2.0b1.