Release Notes; upgrade information mainly.
Features/major bugfixes are listed in NEWS
+portage-2.1.5
+==================================
+
+* The parallel-fetch feature is now enabled by default. It is optimized
+ to avoid doing redundant checksums for previously downloaded files that have
+ the correct size. Run `tail -f /var/log/emerge-fetch.log` in a
+ terminal to view parallel-fetch progress. Add FEATURES="-parallel-fetch"
+ to /etc/make.conf if you want to disable this feature.
+
+* For extra careful dependency handling, emerge has a new --complete-graph
+ option that causes it to consider the deep dependencies of all packages from
+ the system and world sets. With this option enabled, emerge will bail out
+ if it determines that the given operation will break any dependencies of
+ the packages that have been added to the graph. Unlike the --deep option,
+ the --complete-graph option does not cause any more packages to be updated
+ than would have otherwise been updated with the option disabled.
+
portage-2.1.4.1
==================================
Disables xterm titlebar updates (which contains status info).
.TP
.B parallel\-fetch
-Fetch in the background while compiling.
+Fetch in the background while compiling. Run
+`tail \-f /var/log/emerge\-fetch.log` in a
+terminal to view parallel-fetch progress.
.TP
.B sandbox
Enable sandbox\-ing when running \fBemerge\fR(1) and \fBebuild\fR(1).