Make timestamps ISO compliant

[pditommaso]

Tentative implementation for adding timezone info in the timestamp string used by nextflow

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[pditommaso]

An option is to make the timestamp date format configurable via the variable NXF_DATE_FORMAT.

Still some work needs to be done to adapt some templates, like the report ones

nextflow/modules/nextflow/src/main/resources/nextflow/mail/notification.html

Lines 55 to 62 in cebad36

	<tr>
	<td>Launch time</td>
	<td>${workflow.start.format('dd-MMM-yyyy HH:mm:ss')}</td>
	</tr>
	<tr>
	<td>Ending time</td>
	<td>${workflow.complete.format('dd-MMM-yyyy HH:mm:ss')} (duration: ${workflow.duration})</td>

nextflow/modules/nextflow/src/main/resources/nextflow/mail/notification.txt

Lines 25 to 26 in cebad36

	Launch time : ${workflow.start.format('dd-MMM-yyyy HH:mm:ss')}
	Ending time : ${workflow.complete.format('dd-MMM-yyyy HH:mm:ss')} (duration: ${workflow.duration})