Reader fix: the reader will not error out duplicate cell
names, but rename the cells.
Writer fix: the writer will uniquify cell names *after*
illegal character substitution.
Target is to reduce the properties repository to a singleton.
Hence, there is no need to translate property IDs and it
is possible to retrieve properties everywhere.
The OASIS reader is refactored to avoid property renaming
and change of property definitions per ID.
* [CONSIDER MERGING] Clarification and typo fixed in DRC doc.
* Implemented #1097 (discourage file compression, use CBLOCK)
* A warning is printed if file compression is enabled on OASIS
* A hint is present in the writer options
* CBLOCK is default (with fresh config) and for buddy tools
(use --cblock=false to disable it)
* Strict mode is default too.
* Updated tests