Updated copyright notices to include the year 2018.

lib-fs: Add fs_file/iter_init_parent()

lib-fs: Split allocation from fs.file_init() to a separate fs.file_alloc()

global: Fix spelling mistakes in comments Original work by @andreasschulze and @jsoref

global: start relying on [io]_stream_unref(NULL) being a no-op Cleanup performed with the following semantic patch: @@ expression E; @@ - if (E != NULL) { - i_stream_unref(&E); - } + i_stream_unref(&E); @@ expression E; @@ - if (E != NULL) { - o_stream_unref(&E); - } + o_stream_unref(&E);

global: start relying on [io]_stream_destroy(NULL) being a no-op Cleanup performed with the following semantic patch: @@ expression E; @@ - if (E != NULL) { - i_stream_destroy(&E); - } + i_stream_destroy(&E); @@ expression E; @@ - if (E != NULL) { - o_stream_destroy(&E); - } + o_stream_destroy(&E);

global: Remove random_init/random_deinit calls lib already initializes it.

Updated copyright notices to include the year 2017.

mail-crypt: Add mail-crypt plugin