[FIX] excessive coherence between BufferedDataSet cache and to_write and to_create queues                                                                                       ~/projects/tiny/web/current
[FIX] excessive coherence between BufferedDataSet cache and to_write and to_create queues                                                                                       ~/projects/tiny/web/current

cache should hold readable values (so pairs for m2o fields), whereas
to_create and to_write hold the data which will be processed into o2m
commands and sent over the wire to create, write and context-value
calls. As a result, to_create and to_write should only have atomic ids
for m2o fields.

Therefore, only use fixed m2o values to store in read cache.

gisce/openerp-web,splbio/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,vnc-biz/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web,MarkusTeufelberger/openerp-web,vnc-biz/openerp-web