without metadata
Merge remote-tracking branch 'origin/master'

Conflicts:
	.metadata/.log
	.metadata/.plugins/org.eclipse.core.resources/.projects/Library_manager/org.eclipse.jdt.core/state.dat
	.metadata/.plugins/org.eclipse.core.resources/.root/.indexes/properties.index
	.metadata/.plugins/org.eclipse.core.resources/.safetable/org.eclipse.core.resources
	.metadata/.plugins/org.eclipse.core.runtime/.settings/org.eclipse.ui.workbench.prefs
	.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi
	.metadata/.plugins/org.eclipse.jdt.core/1546907657.index
	.metadata/.plugins/org.eclipse.jdt.core/externalFilesCache
	.metadata/.plugins/org.eclipse.jdt.core/externalLibsTimeStamps
	.metadata/.plugins/org.eclipse.jdt.core/nonChainingJarsCache
	.metadata/.plugins/org.eclipse.jdt.core/savedIndexNames.txt
	.metadata/.plugins/org.eclipse.jdt.core/variablesAndContainers.dat
	.metadata/.plugins/org.eclipse.jdt.launching/.install.xml
	.metadata/.plugins/org.eclipse.jdt.launching/libraryInfos.xml
	Library_manager/bin/Admin_BookAdd.class
	Library_manager/src/Admin_BookAdd.java
	Library_manager/src/Admin_BookUpdat.java
	Library_manager/src/Admin_BookUpdat_db.java
	Library_manager/src/Admin_menu.java
	Library_manager/src/Library_main.java