* Fixes NB#91094, removed a comment pmo-trunk-r6183
* Fixes NB#80090, fixed a crash when viewing messages with attachments pmo-trunk-r4119
Adapted to API change for Tinymail rev 3304 pmo-trunk-r4100
Partially fixes NB#77528 Solves a memory problem when obtaining the size of an attachemnt * modest-count-stream.[ch] : implementation of TnyStream to get the size of a stream withou wasting extra memory * widgets/modest-attachment-view.c : uses the former to get the size of attachments * modest-mail-operation.c : removed two redundant lines * modest-tny-send-queue.c : check for NULL value before a strdup() pmo-trunk-r3870