Improve rounding behavior of CalculateBytesTxTime and CalculateBitsTxTime

The new time printing format uses "automatic" promotion to scientific
notation - just like for normal doubles.

* make some internal APIs public to facilitate cross-layer solutions
* set IP TTL to 1 for the OLSR socket

This commit:
	- Add DpdkNetDeviceHelper
	- Encapsulate EAL arguments setup in DpdkNetDeviceHelper
	- Update Documentation
Co-authored-by: Harsh Patel <thadodaharsh10@gmail.com>
Co-authored-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>

m_nodeId was set in FdNetDevice::StartDevice. This commit moves it to
FdNetDevice::SetNode so that is it set whenever node is set.

Also fixed issue in which RoutingProtocol::PrintRoutingTable () was not
using the provided Time::Unit to format the routing table entry lifetimes
or settling times.

Also fixed issue in which AodvRoutingProtocol::PrintRoutingTable () was not
using the provided Time::Unit to format the routing table entry lifetimes.

* add Verbose attribute to TapBridge to call tap creator with the -v option
* adds "this" to NS_FUNCTION_LOG calls in TapBridge
* add branch on tap creator call to check if call exited with a signal

 * Add --enable-build-version option to control build version feature
 * Disable build version when --enable-build-version is not specified
 * Update getting started tutorial to reflect the new build option

Use hash table to lookup nodes by IP addresses rather than linear search

Default size of a DropTailQueue is "100p" and error-model-test-suite calls
Send directly (rather than relying on flow control).  Previously, the
rest of the packets would be sent instantly, but previous commit fixes
that bug, so this commit makes the buffer large enough to hold all packets

Also consolidate scheduling logic into ScheduleTransmit() rather than
repeating in both SendFrom() and TransmitComplete()

Preserve original test case as one of the options, but add coverage for the single-packet queue case,
which led to !409, as well as some other potential edge cases.

Remove a spurious check for queue occupancy in SimpleDevice::TransmitComplete that could lead to double sends. See MR !409 for details.