Revisions to new app welcome pages.
remove unnecessary scl enable, we handle all scl paths in global macros
bug 985784: Unable to add database cartridge to apps again after removing it due to TCP connection stays in CLOSE_WAIT status
fix bz1032765 - stray args will be treated as erroneous
fix bz1031821 - node exceptions are now propagated. Failed ops are also mentioned in the error message
Merge pull request #4234 from maxamillion/admiller/fix_node-proxy_build

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Merge pull request #4237 from lnader/card_169

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Merge pull request #4230 from bparees/mysql_port_in_use

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Merge pull request #4238 from rajatchopra/fix_ctl_user

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Merge pull request #4213 from lnader/master

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Merge pull request #4241 from rajatchopra/fix_parallel_msg

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Ensuring that app is not saved without core attributes set
Merge pull request #4211 from abhgupta/abhgupta-dev

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Fix upgrade tests
Merge pull request #4233 from sg00dwin/app-start

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Merge pull request #4243 from pmorie/dev/fix-tests

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Bug 1032436
Added respond_to checking prior to valid_encoding